No liquid applied product alone will successfully fix holes in gutters. The best solution is to cut and attach flashing metal to cover the holes, and then seal it in a bed of liquid Polyprene®. Also, seal all edges on the perimeter of your patch with Topps Polyprene®. Polyprene is a heavy-bodied and equally heavily fibered 100% mastic that simply can never dry out and get brittle, creating a durable seal for gutters, seams and flashings.